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Diagram of Refrigerant Cycle & Wiring
Refrigerant Flow Diagram
INDOOR UNIT
Gas piping
Liquid piping
Heating cycle
Cooling cycle
Electrical Wiring Diagram
W1
B
C
R
Y
G
Thermostat
Note:
The SI wire between the indoor and outdoor units is not mandatory, especially when the outdoor unit is connected to an
indoor unit of a different brand. It is more energy-efficient when the outdoor unit is connected to a Pioneer indoor unit via SI
wire. However, it still can run without it.
If the matching indoor (air handling) unit does not have an S1 terminal, then ignore the S1 to S1 connection.
OUTDOOR UNIT
Pressure sensor
P
Wide service valve
4-way valve
Check valve
Service valve
EEV
Note:High pressure switch and low pressure switch are only valid for 48K/60K models.
G R C
W1 SI
Indoor unit
L1 L2 PE
Power supply
Compressor
Accumulator
L
Low pressure switch
P
High pressure switch
(L2)
C B Y W SI
(L1)
Outdoor unit
Power supply
3
OR
(L1)
(L2)
Power
()
terminal
panel
Power supply
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